Recording-telephone.



1. F. MALTHANER. RECORDING TELEPHONE.

APPLICATION EILED AUG.3, 1915- Patented Jan. 7,1919.

3 SHEETS-SHEET I.

I. F. MALTHANER.

RECORDING TELEPHONE.

APPLICATION FILED Aua. a. 191a.

Patentd J an. 7,1919.

3 SHEETS-SHEEI 2.

O O O O O vwc 11 foz Patented Jan. 7,1919.

3 SHEETSSHEE'I '3 1 F MALTHANER RECORDING TELEPHONE. APPLICATION FILED AUG-3. 1915- Emma fim MW burrs aerate Jenn r. MALTHANER,-OF ATLANTA, enoisem.

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Laeeeen Specification of Letter s latent.

. retested Jan. a, ota.

Application filed August 3, 1915. Serial No. 43,471

To all whom it may concern: I y I Be it known that 1, JOHN F. MALTHANER,

Y a citizen of the United States, and resident of Atlanta, county. of Dekalb, State of Georgia, have invented certain new and useful Improvements in Recording-Telephones, which the following is a specification.

My invention relates to a dictating telephone and more particularly to a device of that character which may be of convenient size and weight for use on an oflice desk 01 This application constitutes a modification of my pending application Serial No.

The objects and novel features of the invention will be apparent from the follow- .ing description taken in connection with the drawing, in which;

Figure 1 is a plan view of a device embodying my invention.

Fig. 2 is a vertical sectional view of the same.

Fig. 2" is a detail view of a spring. A Fig. 3 is a bottom plan view of the device with the base plate removed.

Fig. 4c is a side elevation illustrating a modified form of the invention.

Fig. 5 is a diagrammatic view of the ap paratus and the circuits connecting the parts of the mechanism.

Fig. 6 is a vertical cross sectional. view of an improved recorder arranged to fit a standand recorder frame.

Fig. 7 is a bottom plan view of the same.

Fig. 8 is a horizontal cross section of the same on the line 88 of Fig. 6.

Fig. 9 is a plan view of the counter weight and supporting spring for the recorder frame.

Figs. 10 and 11 are perspective views of the improved diaphragms or reeds designed for use on the recorder as shown in Figs. 6 to 8.

Referring to Figs. 1 and 2 particularly, the apparatus comprises a stamped sheet metal casing 10 which has an opening 11 in its front side wall and an opening 12 in its top wall. ing is held in place by the braces 14 secured to the bottom 13 and front and rear the face of the gate.

The inside bottom 13 of the casside walls of thecasing. A felt pad'l covers the, outside surface of the bottom wall 13' and is clamped in place at its edges so as to provide a bottom and lateral edges which will not mar the desk.

' A telephone transmitter T of the usual or any preferred construction is mounted within the casmglO and 'a sound inlet duct 16 is secured to the front'face of the casing 171 of the transmitter T centrally. thereof.

The sound inlet duct 16 has a tube 17 connected to its outer end and-substantially coaxial with the inlet duct 16. CA flexible speaking tube 18 fits into the outei end of the tube 17 whichextends in an upward di- 18 hasa flaring mouth piece 19 connected to the outer end thereof, and it is arranged so that it may be bent and will'hold anydesired adjusted position. The sound inlet -16 has an upwardly extending sound tube or duct 20 connected thereto which extends through the opening 12 in the top of'the casing 10 and has a lateral flange 21 which rests on and is secured to the top surface of the casing 10 whereby the transmitter and the parts connected thereto are supported in the casing. The axis of the duct -rection through the'opening 11 in the front wall of the casing 10. The speaking tube 20 is disposed at an angle to the axis of the inlet 16 and tube 17 and consequently the sound waves entering the inlet 16 from the duct 20 will strike the transmitter Elia-- phragm d in a more direct manner than if the duct 20 were mounted at. right angles to the tube 17.

At the point where the duct 20 opens into the inlet-16 and on the opposite side of the axis of the duct 20 from the transmitter 'l is mounted a gate or closure 22. The gate 22 is pivoted at 23 so that it may swing down and prevent communication between the speaking tube 18 and inlet 16 as indicated in dotted lines. The gate 22. is normally in the position shown in Fig. 2 and is held in that position by a rod 24 which hasa curved part 25 fitting into a recessl26 in rod 24- has a button 27 which is engaged on the underside by a fiat spring 29, shown in plan in Fig. 2 The spring 29-is curved so that it will fit around the outside of the duct 20 and is fastened on the opposite side from the pin 27 by the screw 30. Normally the spring 29 will hold the rod 24 in elevated position and the duct 20 will be closed.

At its upper end the 7 When it is desired to makea phonographic record of a telephone message the, receiver It as shown in'dotted lines in Fig. 2 is set so that its sound outlet 31 Wlll register with the entrance 32 ofthe duct '20. The, recelver R is supported on a felt ring 33 which is I. -mounted on the flange 2-1" and heldin place byvthe rim 34 at the edge of, said flange.

When the receiver R is set 1n place it engages :the head of the button 27 and depresses the same against the tension of'the spring 29 so thatthe gate 22. will drop into the position shown in dotted lines,"opening the duct at the lower end and closing the duct leading from the mouth piece 19.

For dictation purposes the device is set I inear the edge of the desk and directly infront of the operator with the mouth ,piece, 19 located in the position desired. This al-v lows both hands free to handle the, correspondence and gives an unobstructed vision.-

If preferred the machine maybe equipped with a horn similar to the hard rubber horn 38 illustrated in Fig. 7 4 the outer end of which is flaring and which extends upwardly from the transmitter T.

In Fig.- 5. I have shown diagrammatically the circuits which connect the difierent parts of the. mechanism together. graph record medium is;indicated.diagram matically at P and is in the form ofa cylinder and adapted tobe engaged by a stylus 81 carried by a diaphragm 7 9 which is mounted at its opposite sides in a 'fr'ame 76. The

frame 76 carries an electromagnet consisting of a core 42 and a winding 43. The electromagnet is designedlto vibrate the diaphragm 79 andstylus 81, and the winding 43 thereof is connected at one side by the wire 44 to a battery B. The other side ot the winding is connected by a wire 45" to the secondary winding46 of an induction coil I. The other side of the winding is also connected by a" wire 47 to a watch case receiver 48. The

other terminal on the watch case' receiver 48 is connected by a conductor 49 to a condenser 50. -The secondary winding 46 and the con denser 50 are connected by the wires 51 and 52' respectively to the "contact spring 53 of the push button switch. 54. It will thusbe seenthat the secondary-winding 46 and the circuit containing the telephone instrument 48 and condenser 50 are in parallel with one another. -The transmitter Thas one of its terminals connected to an intermediate contact of the. battery B by a conductor55 and The phonobutton 64. is depressed. In order to indicate when the push button 64 is depressed I provide a lamp 65 which is connected by the conductors 66 and 67 to the battery B when the push'button is depressed. The push buttonandlamp are located on thetop of the I at its lower end it has two pairs of connecting-terminals 641 wherebythe proper wires shown Fig. 5 are connected thereto. The connection block 68 is placed at the extreme bottom of'the side wall of the casing 10 andthe curvature of the transmitter provides ample room for the same at that part of the casing.

The watch case receiver 48 when not in use is supportedina holder 69 on the outside of the cas ng 10 and the conductors 47 and. 49

' extend through the hard rubber bushings 70 in thewall of the casing to the connection I block 68 which has the terminals 681 thereon v for the various circuits. N

The watch case receiver 48 is of the standard commercial permanent magnet type but circuit arrangement than-the standard commercial device. The condenser50 is of small capacity, about one-tenth M. F. capacity and prevents the flow of direct current inthat circuit. The highly sensitive watch case receiver is capable of reproducing the vibrations as registered by the receiver R and the volume is notimpaired to any great extent. The circuit arrangement permits from 85 to 90 per cent. of 1 the voice undulations delivered by the induction coil to be passed to the magnetic recorder.

The dictating telephone is designed to be utilized primarily for, correspondence dictation and by the use of the locking key 64 on the casing I overcome any necessity of changes or additions to the commercial phonograph other than that of replacing the regular phonographicrecorder with the magnetic recorder.

.Referring toFi s. 6 to 11 the improved form of recorder il ustrated comprises a substantiall' threade at its upper end to receive the screw ca 751 and near-itslower end it has a circu ar projection 752 which provides a shoutder to support the casing in the usual rccorder frame of a standard Edison phonograph. The walls of the casing are bored is utilized to choke the receiver circuit and v cylindrical casing 75 which is to receive bushings 753 which carry the terminal. posts 7 54 by means of which the cir- 'cuit wires 4st and 45 are conne ted to the frame 76 consists of a member of magnetic material bent so as to provide a top portion 768 and two downwardly extending parallel parts 764 and 7 65. At the lower ends of the parts 764 and 765 are two oppositely outwardly extending arms 766 and 7 67, extending at right angles to the arms 764: and 765 respectively, the arm 7 67 being integral with the arm 761 which forms the pivoting support for the magnet carrying frame.

The opposite end of the frame 76 is yieldingly supported by means of a counterweight consisting of a solid block-of metal 77 which is pivotally supported at the dianietrically opposite sides of the casing by 2 is the pivot screws 771. A. spring plate 7 fastened to the under side of the counterbalance 77 and has the hook 7 7 3 at its outer end to receive a rod 7 7 4: which connects the plate 772 to a hook 7 7 5 located on the opposite side of the magnet d3 from the pivot 762. In order to adjust the weight 77 Iprovide a screw 78 which fits a threaded lug 781 on the top side of the weight 77 and which may be set in any adjustedplosition by a nut 782. It will be obvious at by turning the screw 78 the amount of counterbalancin efi'ect exerted by the'weight 77 may be varied and thereby the frame 76 may be lowered or raised at its outer end. I

The core 42 of the magnet a3 is secured to the top 763 of the frame 76 by a screw 4:21 which draws the core into close contact with the frame 76 so that there will be little or no magnetic leakage at the joint. The opposite end of the core L2 extends to a point substantially opposite the center of a diaphragm or reed 79 which consists of a flexible narrow strip of magnetic material which is secured at its opposite ends by the screws 791 and 7 92 respectively. It will be noticed that the arms 766 and 767 have their bottom faces cut-away for part of the length thereof so as to leave prominences 793 and 794: thereon which support the reed or diaphragm 7 9 a slight distance from the arms leaving the narrow air gaps 795 and 796 between the diaphragm 7 9 and a portion of the frame. By this arrangement the magnetic flux flowing through the pole pieces 7 6d and 765 will in part flow across or jump the small air gaps 795 and 7 96' instead of traveling to the prominences 7 93 and 794. This arrangement increases the efiiciency of the recorder over that shown in my prior application hereinbefore referred to.

The quantity of the magnetic flux through normally substantially m'l and when the electro-magnet is energized an initial quantity of flux willbe established in the magnetic circuit.

The construction of the reedof diaphragm used may be either the one shown in Fig. 10

or theone shown in Fig. 11, the one shown in Fig. 10 being shown in position. The

the magnetic circuit of the electromagnet is reed 79 is narrower at the center than at the ends and approximately at its center it has a soft iron disk 80 which is provided with a shoulder 801 which acts as a mounting for the sapphire or stylus 81. The softiron disk 80. may be secured to the reed or diaphragm 79 by two screws not shown opposite sides of the disk 80 and hold it inposition. In order to dampen the vibrations and prevent cuttings and other foreign substances from getting between the end of the core 42 and the diaphragm 79 I employ a felt washer 82 which surrounds the end of the core and fits between the magnet and diaphragm. I find that for some purposes a reed constructed of the same width from end to end is preferable. This form is shown in Fig. 11 and approximately at its center is mounted a square soft iron disk 80 which is held in place by clips 802 andon its under side has a shoulder for supporting the sapphire in the same way as that shown in Fig. 6. In this form a felt washer is also employed and surrounds the lower end of the magnet core.

The soft iron sapphire mounting is beneficial because it loads the center or approxi- I mate center of the reed and eliminates the is also increased and I am enabled to use a reed of larger gage mild steel than in the device described in my former application referred to above.

By loading the centerof the reed, a hammer effect is obtained which is desirable in this apparatus. Primarily however the arrangement afiords greater mass for the magnetic flux in proximity to the core of the magnet and being of greater diameter than the core of the magnet eliminates oversaturation of the reed or dissipation'of magnetic flux at the point opposite the core of the magnet.

While I have shown and described the de vice in detail I do not wish to be limited to the exact construction set forth as various modifications may be made therein without departing from the spirit of the invention.

Having thus described my invention; what I which the quantity of magnetic-flux isnor I claim and desire tosecure by Letters Patent 1s;

the'diaphragm and an electromagnet in mally substantially mil associated with said diaphragm and stylus, said magnet com 'prisinga soft iron core and a single windmg, a transmitter, direct current supply means, and -means for closingcircuits 1 t rough said transmitter and through said electromagnet so-,that direct current. may

flow through both the'transmitter and electromagnet and thereby establish an initial quantity of magnetic flux-.in said electromagnet. I

the combination of a phonographic record medium, a'diaphragm, a stylus carried b the diaphragm, an ,electromagnet for v1- brating said diaphragm and stylus,.a transmitter, an induction coil having one winding conn'ectedto said transmitter and the other winding connected to said electromagnet,

direct current supply means, and means for closing the circuits through said transmitter, induction coil and, electromagnet so diaphragm and stylus, a'tran smitter, anin- I duction coil having onev Winding connected to said transmitter and the other winding connected to said electromagnet, direct current supply means, and a switch device havmg contacts connected to the windings of the induction coil and to the direct current supply means and adapted to close the circults through said "transmitter, inductionv coil, andelectromagnet and thereby establish an initial quantity of magnetic flux in said induction coil and electromagnet.

. 4:. In an apparatus of theclass described, the combination of a phonographic-record medium, a diaphragm, .a stylus carried by the diaphragm, an electromagnet for v1- brating said diaphragm and stylus, a tele-.

phone transmitter, a battery, an induction coil having its primary winding connected to the telephone transmitter and having its secondary winding connected to the electromagnet, and a push button switch device having separate contacts connected to the primary and secondary windings of the induction coil and to the battery and adapted to connect said battery with said windings] so that olirect current from said battery may 2. .In an apparatus of the class described,"

flow through said windings and ,through' I.

v the transmitter and electromagnet'. 1. In an apparatus of the class described,

the combination of afphonographic record 5 medium, adiaphrag'm, a styluscarried by 5. In an apparatus of theclass described,

medium a diaphragm a stylus carried b the diaphragm, an electromagnet for vi bratingsaid diaphragm and stylus, a telephone transmitter, an induction coil having a primary winding connected to the telephone transmitter and a'secondary-winding' connected to. said transmitter andto said electromagnet,-fa telephone instrument and a condenser connected in parallel circuit with the. secondary 'windingfof said coil, and means for connecting the windings of the induction coil and the circuit including said telephone instrument and condenser to said battery so that current may flow throuIgh said transmitter and electromagnet. 11 an apparatus of the class "described,

medium,a diaphragm, a stylus carried by the diaphragm, an electromagnet'forvibrat- 1ng saiddiaphragin -andstylus, a telephone transmitter, aninduction coll having a priconnected to the electromagnet, a battery.

the combination of a phonographic record mary winding connectedto thetel'ephone transmitter .and .a secondary winding con- 1 nected to the'electromagnet, a battery connected to said transmitter and to said electromagnet, a telephone instrument and a -condenser connected in parallel circuit with the secondary winding of said induction coil, a push button circuit closer having con-- tacts connected to the primary and secondary windlngs-of said induction coil, to the circuit including said condenser and'telephone instrument, and to said battery and adapted to close the circuits through said transmitter and-through said electromagnet so that 'curent may flow through the transmitter and electromagnet, and a lamp adapt ed to indicate when said closed position 7. In an apparatus of the class described, the combination of a casing, a telephone transmitter inside the casing, said transmitter having a sound inlet, and a sound duct connected at one end to the sound inlet of said transmitter .and extending outside of the casing and upwardly therefrom;

8. In an apparatus of the class described, the combination of a' casing having an opening in its top wall and an opening in aside Wall thereof, a telephone transmitter in the casing and having a sound inlet, and sound ducts leading from the openings in said casing to the sound inlet of the transmitter.

9. In an apparatus of the class described, the combination of-a telephone transmitter having a sound inlet, a sound duct connected push button is in'.

' phone transmitter in said casing having a sound inlet, a flexible speaking tube having one end extending through the opening in the side Wall of the casing and connected with the sound inlet of said transmitter, a sound duct leading through said opening in the top of the casing to the inlet of said transmitter, a condenser, an induction coil, and terminal posts located inside said casing and connected to said transmitter, a push button switch mounted on the casing and a sign al lamp mounted on the casing. v

11. In an apparatus of the class described,

the combination of a casing having an opening in its top wall and an opening in one of its side Walls, a telephone transmitter inside said casing having a sound inlet, a duct leading through the side opening in said casing and connected to said sound inlet and a second duct leading through the top opening in the casing to the sound inlet of said transmitter, said second duct having alateral flange which is secured to said casing.

12. In an apparatus of the class described, the combination of a casing having an opening in its top wall and an opening in one of its side walls, a telephone transmitter inside said casing having a sound inlet, a duct leading through said opening in said casing and connected to said sound inlet, a second duct leading to the sound inlet of said transmitter and vhaving a lateral flange secured to the top of said casing, and means for supporting a stantially m'l associated telephone. receiver so that its sound outlet will register with the entrance of said second duct, for the purpose set forth.

13.' In an a paratus of the class described, 7

a telephone transmitter arranged sound inlet, a

inlet and hava second sound the combinatlon of having a centrally sound duct connected to said ing a part coaxial therewith,

duct leading to said sound inlet of the transthe combination of a casing having openings in its walls, a telephone transmitter in the casing having a sound inlet, sound ducts leading through said of the casing to the sound inlet of said transmitter, and a support for a telephone instrument on the outside of said casing.

15. In anapparatus of the class descrlbed, in combination, a phonographic record medium, a diaphragm, a stylus carried by. the diaphragm. an electro-magnet in which the quantity of magnetic flux is normally subwith said dia phragm, a transmitter, a circuit including said magnet, a circuit including said transmitter, a source of direct current for said circuits, and means whereby changes in the circuit containing the transmitter cause changes in the circuit having the magnet. In testimony whereof I aflix my signature.

Witness W. E. Smrson.

of said ducts to said I open ngs in the walls 

